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Which of the following routing technique/techniques is/are used in distributed systems?

(a) Fixed Routing

(b) Virtual Routing

(c) Dynamic Routing


1. (a) only
2. (a) and (b) only
3. (c) only
4. All (a), (b), (c)

1 Answer

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Best answer
Correct Answer - Option 1 : (a) only

The correct answer is option 1.

Distributed systems are using fixed routing whereas dynamic and virtual routing is not used in the distributed system.


Fixed routing: A path from A to B is specified in advance; the path changes only if a hardware failure disables it.

  •  Since the shortest path is usually chosen, communication costs are minimized.
  •  Fixed routing can not adapt to load changes.
  • Ensures that messages will be delivered in the order in which they were sent.

Virtual routing: A path from A to B is fixed for the duration of one session.

  • Different sessions involving messages from A to B may have different paths
  • A partial remedy to adapting to load changes
  • Ensures that messages will be delivered in the order in which they were sent

Dynamic routing: The path used to send a message from site A to site B is chosen only when a message is sent.

  •  Usually, a site sends a message to another site on the link least used at that particular time
  • Adapts to load changes by avoiding routing messages on heavily used path
  • Messages may arrive out of order

Hence the correct answer is (a) only.

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